Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alexander Charles Duncan, PSY.D., ABPP

Psychologist in Portland, OR · enumerated 2009.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1972741205

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Registry record

Entity type Individual (Type 1)

Name Dr. Alexander Charles Duncan

Credential PSY.D., ABPP

Sex Male

Practice address 6124 Se Milwaukie Ave Ste C, Portland, OR, 97202

Phone (503) 807-7180

Fax (503) 236-2700

Enumeration date Jan 23, 2009

Last updated in NPPES Jul 16, 2010

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 1912 (OR) Primary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1972741205 active?

Yes, as of the latest NPPES snapshot, NPI 1972741205 is active (record last updated 2010-07-16).

How do I verify Alexander Duncan's NPI record?

Cross-check NPI 1972741205 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-07-16.